/* author: Louis Hugues - created on 13 janv. 2005  *//*
 *  Simbad - Robot Simulator
 *  Copyright (C) 2004 Louis Hugues
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 -----------------------------------------------------------------------------
 * $Author: sioulseuguh $ 
 * $Date: 2005/08/07 12:24:57 $
 * $Revision: 1.3 $
 * $Source: /cvsroot/simbad/src/simbad/sim/LightSensor.java,v $
 */
package simbad.sim;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.text.DecimalFormat;

import javax.swing.JPanel;

/**
 * This class models a single light sensor. The sensor outputs a float
 * proportionnal to received light. <br>
 * Implementation Note: <br>
 * We use a small camera to implement the light sensor. The camera must look
 * back at the sensor body so as to measured the light received.
 */
public class LightSensor extends Eye {

	float luminance;

	public LightSensor() {
		super(0.5f, 10, 10);
		// super(0.5f, 50, 50);
		luminance = 0;
		rotateY(Math.PI);
	}

	/**
	 * Returns the measured luminance.
	 * 
	 * @return 0.0 means no light , 1.0 f maximum enlightment
	 */
	public float getAverageLuminance() {
		return luminance;
	}

	@Override
	void create3D(float radius) {
		// small body
		super.create3D(0.05f);
	}

	/** Called by simulator */
	@Override
	protected void update() {
		super.update();
		visionImage.getRGB(0, 0, imageWidth, imageHeight, tempRGBABuffer, 0, imageWidth);
		float sum = 0;
		int n = tempRGBABuffer.length;
		for (int i = 0; i < n; i++) {
			int pix = tempRGBABuffer[i];
			int r = (pix >> 16) & 0xff;
			int g = (pix >> 8) & 0xff;
			int b = (pix) & 0xff;
			sum += (r * 0.299f + 0.587f * g + 0.114f * b) / 255.0f;
		}
		luminance = sum / n;
	}

	@Override
	public JPanel createInspectorPanel() {
		return new LigthSensorJPanel();
	}

	/*
	 * a JPanel for displaying the eye image.
	 */
	public class LigthSensorJPanel extends JPanel {

		private static final long serialVersionUID = 1L;
		Color color;
		Font font;
		DecimalFormat format;
		final static int HEIGHT = 12;

		public LigthSensorJPanel() {
			color = new Color(0, 0, 0);
			Dimension d = new Dimension(50, HEIGHT);
			setPreferredSize(d);
			setMinimumSize(d);
			font = new Font("Arial", Font.PLAIN, HEIGHT - 2);
			// display format for numbers
			format = new DecimalFormat();
			format.setMaximumFractionDigits(2);
			format.setMinimumFractionDigits(2);
			format.setPositivePrefix("");
			format.setMinimumIntegerDigits(1);

		}

		/* should not be called too often */
		@Override
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.setFont(font);
			color = new Color(luminance, luminance, luminance);
			g.setColor(color);
			g.fillRect(0, 0, HEIGHT, HEIGHT);
			g.setColor(Color.BLACK);
			g.drawString("luminance=" + format.format(luminance), HEIGHT + 10, HEIGHT - 1);

		}
	}
}